Relativity‎,‎ almost a hundred years old in its classic Einsteinian form‎,‎ is one of the most fascinating threads running through science from Galileo‎'‎s day to ours‎.‎ This book‎,‎ based on a short course at the University of Sussex‎,‎ presents relativity as a natural outgrowth of dynamics‎:‎ the concepts are introduced through careful physical reasoning and simple mathematics‎,‎ and are then applied over a wide range‎,‎ well meshed with current undergraduate syllabuses‎.‎ Features An accessible introduction through pre‎-Einstein relativity Scrupulously assessed experimental evidence ‎(‎mostly modern‎)‎ Elementary mathematics‎,‎ aimed at a working acquaintance with kinematics‎,‎ energy and momentum conservation‎,‎ and the propagation of plane waves The book includes many carefully chosen examples and student problems Introduction to the Relativity Principle is suitable for undergraduates studying physics‎,‎ also as a preliminary to more formal courses designed for mathematicians‎.‎